2156022561440 has 96 divisors (see below), whose sum is σ = 5577316093440. Its totient is φ = 781093504000.

The previous prime is 2156022561409. The next prime is 2156022561449. The reversal of 2156022561440 is 441652206512.

It is a junction number, because it is equal to n+sod(n) for n = 2156022561394 and 2156022561403.

It is not an unprimeable number, because it can be changed into a prime (2156022561449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1803536 + ... + 2750415.

It is an arithmetic number, because the mean of its divisors is an integer number (58097042640).

Almost surely, 2^{2156022561440} is an apocalyptic number.

2156022561440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156022561440 is an abundant number, since it is smaller than the sum of its proper divisors (3421293532000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156022561440 is a wasteful number, since it uses less digits than its factorization.

2156022561440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554246 (or 4554238 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

Adding to 2156022561440 its reverse (441652206512), we get a palindrome (2597674767952).

The spelling of 2156022561440 in words is "two trillion, one hundred fifty-six billion, twenty-two million, five hundred sixty-one thousand, four hundred forty".